From 84c39b405972516a9be2e8be8729097f8691050f Mon Sep 17 00:00:00 2001
From: sinanmohd <sinan@sinanmohd.com>
Date: Fri, 17 Oct 2025 08:31:18 +0530
Subject: chore(os/kay): refactor

---
 os/kay/modules/network/headscale.nix | 112 +++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 os/kay/modules/network/headscale.nix

(limited to 'os/kay/modules/network/headscale.nix')

diff --git a/os/kay/modules/network/headscale.nix b/os/kay/modules/network/headscale.nix
new file mode 100644
index 0000000..24df170
--- /dev/null
+++ b/os/kay/modules/network/headscale.nix
@@ -0,0 +1,112 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+let
+  domain = "headscale.${config.global.userdata.domain}";
+  stunPort = 3478;
+
+  # A workaround generate a valid Headscale config accepted by Headplane when `config_strict == true`.
+  settings = lib.recursiveUpdate config.services.headscale.settings {
+    tls_cert_path = "/dev/null";
+    tls_key_path = "/dev/null";
+    policy.path = "/dev/null";
+  };
+  format = pkgs.formats.yaml { };
+  headscaleConfig = format.generate "headscale.yml" settings;
+
+  policyFormat = pkgs.formats.json { };
+  policy = {
+    groups = {
+      "group:owner" = [ "sinan@" ];
+      "group:bud" = [
+        "sinan@"
+        "ann@"
+      ];
+    };
+    tagOwners = {
+      "tag:bud_clients" = [ "group:bud" ];
+      "tag:internal" = [ "group:owner" ];
+      "tag:cusat" = [ "group:owner" ];
+      "tag:gaijin" = [ "group:owner" ];
+    };
+    acls = [
+      {
+        action = "accept";
+        src = [ "group:owner" ];
+        dst = [ "*:*" ];
+      }
+
+      {
+        action = "accept";
+        src = [ "group:bud" ];
+        dst = [ "tag:bud_clients:*" ];
+      }
+    ];
+  };
+in
+{
+  sops.secrets = {
+    "headplane/cookie_secret".owner = config.services.headscale.user;
+    "headplane/preauth_key".owner = config.services.headscale.user;
+    "headscale/noise_private_key".owner = config.services.headscale.user;
+    "headscale/derp_private_key".owner = config.services.headscale.user;
+  };
+
+  networking.firewall.interfaces.ppp0.allowedUDPPorts = [ stunPort ];
+
+  services = {
+    headscale = {
+      enable = true;
+      port = 8139;
+
+      settings = {
+        logtail.enabled = false;
+        server_url = "https://${domain}";
+        noise.private_key_path = config.sops.secrets."headscale/noise_private_key".path;
+        dns = {
+          base_domain = "tsnet.${config.global.userdata.domain}";
+          override_local_dns = false;
+        };
+        derp = {
+          server = {
+            enabled = true;
+            private_key_path = config.sops.secrets."headscale/derp_private_key".path;
+            region_code = config.networking.hostName;
+            region_name = config.networking.hostName;
+            stun_listen_addr = "0.0.0.0:${toString stunPort}";
+            region_id = 6969;
+            automatically_add_embedded_derp_region = true;
+          };
+          urls = [ ];
+        };
+        policy = {
+          mode = "file";
+          path = policyFormat.generate "acl.json" policy;
+        };
+      };
+    };
+
+    headplane = {
+      enable = true;
+      settings = {
+        server = {
+          port = 8140;
+          cookie_secret_path = config.sops.secrets."headplane/cookie_secret".path;
+        };
+        headscale = {
+          url = "https://${domain}";
+          config_path = "${headscaleConfig}";
+        };
+        integration.agent = {
+          enabled = true;
+          pre_authkey_path = config.sops.secrets."headplane/preauth_key".path;
+        };
+      };
+    };
+  };
+
+  environment.systemPackages = [ config.services.headscale.package ];
+}
-- 
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